I can't touch grok... GNU Affero General Public License On Sat, Feb 27, 2021, 9:50 AM Aaron Boxer <boxe...@gmail.com> wrote:
> Hello Everyone, > > For those who aren’t aware, there is a pending PR for a new open source > JPEG 2000 driver, based on the Grok JPEG 2000 library > > https://github.com/OSGeo/gdal/pull/3449 > > Notable Library Features: > > 1. support for reading TLM and PLT markers, for fast random access into > large tiled or single-tiled images > > 2. support for memory mapped files, which helps speed up random access > decode for large images > > 3. internal tile cache that allows efficient reading of multiple tiles > from single Grok codec object > > 4. support for new Part 15 of the JPEG 2000 standard (HTJ2K) which > promises up to **10x** speedup > > of encode and decode > > > Benchmarks: > > I haven't done a thorough comparison between Kakadu, Grok and OpenjPEG, > but here are a few results (more details in PR) > > 1. Compression: multi-tile > > Kakadu is 2X faster than Grok; Grok is 5X faster than OpenJPEG > > 2. Decompression: large single tile image with PLT markers > > Kakadu is 60% faster than Grok; Grok is 2.5x faster than OpenJPEG > > 3. Decompression: 4000x4000 sub-region of large single tile image with PLT > markers > > Kakadu is 40% faster than Grok; Grok is 5X faster than OpenJPEG > > > This year should see Grok reaching performance parity with Kakadu. > > > There is an RFC for the new driver, which is complete, and tested on a few > compression and decompression work flows. > > > Any comments or feedback is very welcome. > > > Cheers, > > Aaron > _______________________________________________ > gdal-dev mailing list > gdal-dev@lists.osgeo.org > https://lists.osgeo.org/mailman/listinfo/gdal-dev >
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